During class, female teacher Reiko is surrounded by students who force her to masturbate. Reiko has been suffering from relentless bullying, and her mind and body have reached their limits. Yet, there's a reason she must continue standing at the lectern—something that originated a year ago with Takeshi, the ringleader of the bullying. Unable to resist him, one day Reiko is lured to the gym storage room and gang-raped. During the assault, noticing something strange about Takeshi's behavior, Reiko resolves to go to his house.